Please document panel serve defaults

[cdeil]

It's great that panel serve is so flexible and has so many options!

The help looks like this (shortened to just two options as example):

$ panel serve --help
...
  --check-unused-sessions MILLISECONDS
                        How often to check for unused sessions
  --unused-session-lifetime MILLISECONDS
                        How long unused sessions last
 ...

Would it be possible that you show the default values in the help output?

Currently I don't know how to find out that the default value e.g. for --unused-session-lifetime is!????

The help output doesn't show it and also I can't find it in the docs: https://panel.holoviz.org/search.html?q=unused-session-lifetime

[hoxbro]

I think we just inherit these from bokeh serve --help.

Look around this look to be set here: https://docs.bokeh.org/en/latest/docs/reference/server/tornado.html#bokeh-server-tornado

check_unused_sessions_milliseconds: int = 17000, 
unused_session_lifetime_milliseconds: int = 15000

So 17 and 15 seconds.

[cdeil]

@Hoxbro - thanks!

Exposing these (and the many other) defaults in the CLI help output for user convenience is difficult, right?

[ahuang11]

Some of the options/flags are in Bokeh so those will need to be changed upstream in Bokeh.

However, there are other CLI defaults that can be documented here: https://github.com/holoviz/panel/blob/ff43d36e14ff84238e0450bd56c7541ca5a0147a/panel/command/serve.py#L86

Perhaps somehow modifying --help to also show default would be nice.